The OP is completely misunderstanding the two things they are trying to conflate.
"Ghosting" is mainly used in dating. It is simply someone who disappears from your life, cuts off all contact and from whom you get no response. Sometimes it's to avoid what they think will be an awkward conversation. Sometimes, as with online dating, it's done to cut down the number of contacts you are trying to deal with. It's unpleasant and can affect the ghosted and the ghost. It has grown because of online dating. If someone had, as we used to hear, "gone out for a loaf of bread and never returned" you would probably have reported them missing. Online, the relationships can be more tenuous and the "relationship" may only have existed online. The sense of loss is often akin to a sense of grieving.
Gaslighting is nothing like this. As others have said, it is an attempt to make you question your sanity, your view of the world. It can and does happen in personal relationships but those are more likely to be actual than online. It can also happen in the workplace. It is not simply a disagreement between how you see things and how someone else does. It is an attempt to undermine someone's sense of self. It can be as simple as continually not giving value to someone else's opinion - as if it is worthless. It can be as petty as continually saying such things as "well, if you haven't got a sense of humour ..." or "you never do the washing up - you just don't do your fair share". If you are defining someone else you are gaslighting - even if it is low level.
Gaslighting can also be very destructive and wear away someone's sense of self. At work or in the home it distorts what is. The "Gaslighter" intends to make the gaslighted feel as if the structure of their world is continuously moving. It can take years to recover, and that may not always be possible. People can be given "tools" to help but more than anything they need to get away from the gaslighter. Because they may be very undermined, very lacking in confidence, this is very hard to do.
Gaslighting could seem a little like ghosting, I suppose. If someone uses not being there when they have agreed to I suppose it's similar but the ghost will not explain - they will just not be there. The gaslighter, on the other hand, will make out that you got it all wrong and whatever did/didn't happen because they didn't turn up is down to you; you misunderstood/are too stupid/are incompetent.